
jQuery.extend({
    

    createUploadIframe: function(id, uri)
    {
            //create frame
            var frameId = 'jUploadFrame' + id;
            var iframeHtml = '<iframe id="' + frameId + '" name="' + frameId + '" style="position:absolute; top:-9999px; left:-9999px"';
            if(window.ActiveXObject)
            {
                if(typeof uri== 'boolean'){
                    iframeHtml += ' src="' + 'javascript:false' + '"';

                }
                else if(typeof uri== 'string'){
                    iframeHtml += ' src="' + uri + '"';

                }   
            }
            iframeHtml += ' ></iframe>';
            jQuery(iframeHtml).appendTo(document.body);

            return $(iframeHtml).get(0);            
    },
    createUploadForm: function(id, fileElementId, data)
    {
        //create form   
        var formId = 'jUploadForm' + id;
        var fileId = 'jUploadFile' + id;
        var form = jQuery('<form  action="" method="POST" name="' + formId + '" id="' + formId + '" enctype="multipart/form-data"></form>');    
        if(data)
        {
            for(var i in data)
            {
                jQuery('<input type="hidden" name="' + i + '" value="' + data[i] + '" />').appendTo(form);
            }           
        }       
        var oldElement = jQuery('#' + fileElementId);
        var newElement = jQuery(oldElement).clone();
        jQuery(oldElement).attr('id', fileId);
        jQuery(oldElement).before(newElement);
        jQuery(oldElement).appendTo(form);


        
        //set attributes
        jQuery(form).css('position', 'absolute');
        jQuery(form).css('top', '-1200px');
        jQuery(form).css('left', '-1200px');
        jQuery(form).appendTo('body');      
        return form;
    },

    ajaxFileUpload: function(s) {
        // TODO introduce global settings, allowing the client to modify them for all requests, not only timeout        
        s = jQuery.extend({}, jQuery.ajaxSettings, s);
        var id = new Date().getTime()        
        var form = jQuery.createUploadForm(id, s.fileElementId, (typeof(s.data)=='undefined'?false:s.data));
        var io = jQuery.createUploadIframe(id, s.secureuri);
        var frameId = 'jUploadFrame' + id;
        var formId = 'jUploadForm' + id;        
        // Watch for a new set of requests
        if ( s.global && ! jQuery.active++ )
        {
            jQuery.event.trigger( "ajaxStart" );
        }            
        var requestDone = false;
        // Create the request object
        var xml = {}   
        if ( s.global )
            jQuery.event.trigger("ajaxSend", [xml, s]);
        // Wait for a response to come back
        var uploadCallback = function(isTimeout)
        {           
            var io = document.getElementById(frameId);
            try 
            {               
                if(io.contentWindow)
                {
                     xml.responseText = io.contentWindow.document.body?io.contentWindow.document.body.innerHTML:null;
                     xml.responseXML = io.contentWindow.document.XMLDocument?io.contentWindow.document.XMLDocument:io.contentWindow.document;
                     
                }else if(io.contentDocument)
                {
                     xml.responseText = io.contentDocument.document.body?io.contentDocument.document.body.innerHTML:null;
                    xml.responseXML = io.contentDocument.document.XMLDocument?io.contentDocument.document.XMLDocument:io.contentDocument.document;
                }                       
            }catch(e)
            {
                jQuery.handleError(s, xml, null, e);
            }
            if ( xml || isTimeout == "timeout") 
            {               
                requestDone = true;
                var status;
                try {
                    status = isTimeout != "timeout" ? "success" : "error";
                    // Make sure that the request was successful or notmodified
                    if ( status != "error" )
                    {
                       
                        // process the data (runs the xml through httpData regardless of callback)
                        //var data = jQuery.uploadHttpData( xml, s.dataType );    
                        // If a local callback was specified, fire it and pass it the data
                        if ( s.success )
                            s.success( data, status );
    
                        // Fire the global callback
                        if( s.global )
                            jQuery.event.trigger( "ajaxSuccess", [xml, s] );
                    } else
                        jQuery.handleError(s, xml, status);
                } catch(e) 
                {
                    status = "error";
                    jQuery.handleError(s, xml, status, e);
                }

                // The request was completed
                if( s.global )
                    jQuery.event.trigger( "ajaxComplete", [xml, s] );

                // Handle the global AJAX counter
                if ( s.global && ! --jQuery.active )
                    jQuery.event.trigger( "ajaxStop" );

                // Process result
                if ( s.complete )
                    s.complete(xml, status);

                jQuery(io).unbind()

                setTimeout(function()
                                    {   try 
                                        {
                                            jQuery(io).remove();
                                            jQuery(form).remove();  
                                            
                                        } catch(e) 
                                        {
                                            jQuery.handleError(s, xml, null, e);
                                        }                                   

                                    }, 100)

                xml = null

            }
        }
        // Timeout checker
        if ( s.timeout > 0 ) 
        {
            setTimeout(function(){
                // Check to see if the request is still happening
                if( !requestDone ) uploadCallback( "timeout" );
            }, s.timeout);
        }
        try 
        {

            var form = jQuery('#' + formId);
            jQuery(form).attr('action', s.url);
            jQuery(form).attr('method', 'POST');
            jQuery(form).attr('target', frameId);
            if(form.encoding)
            {
                jQuery(form).attr('encoding', 'multipart/form-data');               
            }
            else
            {   
                jQuery(form).attr('enctype', 'multipart/form-data');            
            }           
            jQuery(form).submit();

        } catch(e) 
        {           
            jQuery.handleError(s, xml, null, e);
        }
        
        jQuery('#' + frameId).load(uploadCallback);
        return {abort: function () {}}; 

    },
  uploadHttpData: function( r, type ) {
        var data = !type;
        data = type == "xml" || data ? r.responseXML : r.responseText;
        // If the type is "script", eval it in global context
        if ( type == "script" )
            jQuery.globalEval( data );
        // Get the JavaScript object, if JSON is used.
        if ( type == "json" )
            eval( "data = " + data );
        // evaluate scripts within html
        if ( type == "html" )
            jQuery("<div>").html(data).evalScripts();

        return data;
    }
    
    // handleError: function( s, xhr, status, e ) {
    //     // If a local callback was specified, fire it
    //     if ( s.error ) {
    //         s.error.call( s.context || window, xhr, status, e );
    //     }

    //     // Fire the global callback
    //     if ( s.global ) {
    //         (s.context ? jQuery(s.context) : jQuery.event).trigger( "ajaxError", [xhr, s, e] );
    //     }
    // }
});


// function paras(a){
//     var b={};
    
//     if(a.indexOf("?")==-1)return{};
        
//     var c=a.split("?")[1].split("&");
//     for(var d=0;d<c.length;d++)if(c[d].indexOf("=")!=-1){
//         var e=c[d].split("=");
//         b[e[0]+""]=e[1]+""
//         }
//         return b
//     }
//     jQuery.extend({
//     createUploadIframe:function(a,b){
//         var c="jUploadFrame"+a,d="";
//         window.ActiveXObject&&(typeof b=="boolean"?d="javascript:false":typeof b=="string"&&(d=b));
//         return $('<iframe src="'+d+'" id="'+c+'" name="'+c+'" style="position:absolute;top:-9999px;left:-9999px;"></iframe>').appendTo("body")
//         },
//     createUploadForm:function(a,b,c){
//         var d="jUploadForm"+a,e="jUploadFile"+a,f=$('<form action="" method="POST" name="'+d+'" id="'+d+'" enctype="multipart/form-data"></form>'),g=$("#"+b),h=$(g).clone();
//         g.attr("id",e).before(h),g.appendTo(f);
//         if(c!="undefined")for(var i in c)$('<input value="'+c[i]+'" name="'+i+'"/>').appendTo(f);$(f).css("position","absolute").css("top","-1200px").css("left","-1200px").appendTo("body");
//         return f
//         },
//     ajaxFileUpload:function(a){
//         a=jQuery.extend({},jQuery.ajaxSettings,a);
//         if(!a.allowType.test(($("#"+a.fileElementId)[0].value||"").toLowerCase())){
//             a.begin(12);
//             return!1
//             }
//             var b=(new Date).getTime(),c=jQuery.createUploadForm(b,a.fileElementId,a.extra),d=jQuery.createUploadIframe(b,a.secureuri),e="jUploadFrame"+b,f="jUploadForm"+b;
//         a.global&&!(jQuery.active++)&&jQuery.event.trigger("ajaxStart"),a.begin&&a.begin("");
//         var g=!1,h={};
        
//         a.global&&jQuery.event.trigger("ajaxSend",[h,a]);
//         var i=function(b){
//             var d=document.getElementById(e);
//             d.contentWindow?(h.responseText=d.contentWindow.document.body?d.contentWindow.document.body.innerHTML:null,h.responseXML=d.contentWindow.document.XMLDocument?d.contentWindow.document.XMLDocument:d.contentWindow.document,h.responsePar=paras(d.contentWindow.location.href)):d.contentDocument&&(h.responseText=d.contentDocument.document.body?d.contentDocument.document.body.innerHTML:null,h.responseXML=d.contentDocument.document.XMLDocument?d.contentDocument.document.XMLDocument:d.contentDocument.document,h.responsePar=paras(d.contentDocument.location.href));
//             if(h||b=="timeout"){
//                 g=!0;
//                 var f;
//                 f=b!="timeout"?"success":"error";
//                 if(f!="error"){
//                     var i=jQuery.uploadHttpData(h,a.dataType);
//                     a.success&&a.success(i,f),a.global&&jQuery.event.trigger("ajaxSuccess",[h,a])
//                     }else jQuery.handleError(a,h,f,"timeout"),$(d).remove(),$(c).remove();
//                 a.global&&jQuery.event.trigger("ajaxComplete",[h,a]),a.global&&!--jQuery.active&&jQuery.event.trigger("ajaxStop"),a.complete&&a.complete(h,f),jQuery(d).unbind(),setTimeout(function(){
//                     $(d)!=[]&&$(d).remove(),$(c)!=[]&&$(c).remove()
//                     },200),h=null
//                 }
//             };
        
//     if(a.timeout>0)var j=setTimeout(function(){
//         g||i("timeout")
//         },a.timeout);
//     try{
//         var d=$("#"+e),c=$("#"+f).attr("action",a.url).attr("target",e).submit()
//         }catch(k){
//         jQuery.handleError(a,h,null,k)
//         }
//         window.attachEvent?document.getElementById(e).attachEvent("onload",i):document.getElementById(e).addEventListener("load",i,!1);
//     return{
//         abort:function(){
//             try{
//                 $(d).remove(),$(c).remove(),clearTimeout(j)
//                 }catch(a){}
//         }
//     }
// },
// uploadHttpData:function(r,type){
//     var data=r.responseText;
//     data.indexOf(">")>0&&(data=data.substring(data.indexOf(">")+1),data=data.substring(0,data.indexOf("<"))),eval("data = "+data);
//     return data
//     }
// })
